Container cap



19, 1 F. w. KALBSKOPF 2,222,103

CONTAINER CAP Filed Dec. 7, 1938 gig gumlllii h 3mm 212:7; J FEED/Mum MAL MlM/K/YLBfiAOP/i Patented Nov. 19, 1940 PATENT OFFICE C'ONTAINERCAP Ferdinand William Kalbskopf, Fullerton, Md., as-

I --signor to The Eastern Cap & Closure 00., Baltimore, Md., a corporation of Maryland Application December 7, 1938, Serial No. 244,466

1 Claim.

This invention refers to can and bottle closures and more particularly to caps of thin metal used for this purpose. It has among its objects to provide a cap that will close expeditiously,

securely and tightly, while of the general structural size and appearance of the conventional types. Qther objects will become apparent as the invention is more fully set forth.

This invention uses a plural thread attachlO ment so arranged as to prevent cross threaded engagement and to permit immediate connection of the cap with the screw threads on the can or bottle, on which it is used. The plural threads are formed on the cap as well as on the bottle 15 or can, and run around about one-half of the circumferential periphery. The threads are allowed to overlap their adjacent threads and are spaced a suitable, but substantial distance apart. The threads are formed to provide a section most 21) suitable, and serve to bind tightly to prevent leakage, while not affecting the facile removal and placing of the cap on the container. The plural arrangement of the threads on both the cap and container, provides a quick attachment,

25 as one-half turn of the cap places it completely in place or removes it, as the case may be. The use of lugs on the caps is eliminated, and special features in the manufacture of the cap that are costly and inconvenient are avoided.

as In the appended drawing which illustrates this invention:

Figure 1 is a view in elevation showing a closure cap embodying this invention, the cap and container being separated from each other,

Figure 2 is a section View taken transversely through the cap indicated in Figure 1,

Figure 3 is an enlarged detail showing a section of the preferred form of screw thread used in the cap.

40 Figure 4 is a plan view showing a closure cap.

Similar reference characters refer to similar parts throughout the drawing.

In the drawing l is a conventional form of bottle or container with a neck 2, having double 5 screw-threaded ribs 3 and 4, raised on its exterior periphery. These screw threads 3 and 4 respectively, extend a little in excess of half around the periphery of the neck, so their end portions I3 and I4 overlap an appreciable amount 50 as indicated, and the spacing of the threads is several times that of the width of the same. The cap for this container is similarly screwthreaded interiorly to permit it to fit on the threads 3 and 4 properly. The corresponding 55 screw threads on the cap are 23 and 24 respectively. The cap is marked II and is formed of thin sheet metal or other suitable material. Its depending ring or skirt I2 is made to fit the neck 2 and extends deeply a suitable amount to enable it to cover the neck a conventional amount. A I conventional rim 5 is formed on this ring. In the section of the screw threads on the cap II as shown in Figure 3, the threads 23 and 24 have their engaging faces 25 formed on an angle a little in excess of a right angle, the tip 26 of the thread is rounded, and its follower face 21 is cut at an angle of about 60. This form of sect-ion has been found to be most suitable to this type of cap attachment with a bottle. The end portions I4 and i3 are further provided with a rounded tongued form as shown, which serves to register the cap threads on those of the bottle with quickness and ease.

The overlap of the threads makes the attachment of the cap secure to the full length of the screw threads, as well as prevents cross threading. It makes the cap go on straight when once adjusted to the threads.

In the use of the cap, the latter is placed on the bottle until the screw threads are adjusted to each other, and then given a half-circumferential turn. This half-turn completes the thread engagement and the cap is brought tightly onto the bottle and through the full screw thread travel. This arrangement avoids the long and 30 continued turning that the single thread form requires, and the time required to do it. The double or plural thread enables the connection to be made just as strongly and in half the time and effort.

The type of screw thread also, assists in this attachment, because it wedges the cap on securely, without permitting it to work loose. The binding action, utilizes the resiliency of the cap material to wedge out the metal on one side 25, of the thread proper and bring the other surface 21 tightly against the thread of the bottle.

Of course, the form of the cap is termed in the trade as a dished out disc form. The screw threads of the cap do not extend above each other, except at their end portions, and as shown in the drawing, they are on different sides of the circumferential periphery. This makes the placing of the cap adjust and tighten itself on both sides of the neck at the same time, and spreads the pressure evenly all around. The top of the cap is preferably indented at 28 as indicated, and the portion 29 knurled to provide a grip and stiffen it.

While but one form of the invention is shown in the drawing and described in the specification, it is not desired to limit this application for patent to this particular construction, other than required by the prior art, as it is appreciated that other forms might be made that would use the same principles and come within the scope of the appended claim.

Having thus described the invention, What is claimed is:

In a container of the class described having plural screw threads helically included and extending semicircumierentially around its neck, a screw cap comprising a dished-out form made of relatively thin material impresses with plural screw threads of proximate semi-circumferential length each positioned opposite each other on the cap with their end portions open and overlapping same by a relatively small amount, and adapted to align, register and attach to the screw threads on the neck, the threads having relatively large bases with the side walls extending outwardly at an angle of 78 on the engaging faces and 60 on the follower faces to the central axis of the cap and meeting in a slightly rounded peripheral juncture to enable the cap to pull down in a direction coming from the axis of the can top, and a rim on the open end portion of the cap to stiffen said portion without materially affecting the resiliency of the screw thread of the cap, substantially as described.

FERDINAND WILLIAM KALBSKOPF. 

